From: Larkin Lowrey <llowrey@nuclearwinter.com>
To: Kent Overstreet <kmo@daterainc.com>
Cc: linux-bcache@vger.kernel.org
Subject: Re: Null pointer oops
Date: Wed, 13 Aug 2014 11:40:51 -0500 [thread overview]
Message-ID: <53EB9513.8010200@nuclearwinter.com> (raw)
In-Reply-To: <CALJ65z=25CrrO9uMc2vfYVAQWb=6eK+OhB5TGJJrCp=D4ALvrQ@mail.gmail.com>
This is making be feel very dumb. I've googled extensively but can't
figure out how to run addr2line for a module.
I'm running Fedora 20 and the kernel did not have debugging symbols. I
downloaded the version with symbols but I don't know if the addresses
are going to be the same. Bcache is a module for me and that's where
things get tricky. Do you have any tips?
--Larkin
On 8/13/2014 12:04 AM, Kent Overstreet wrote:
>
> Any chance you could do an addr2line and get me the exact line where
> it happened?
>
> On Aug 12, 2014 10:02 PM, "Larkin Lowrey" <llowrey@nuclearwinter.com
> <mailto:llowrey@nuclearwinter.com>> wrote:
>
> I got an oops while doing some heavy I/O. I have an md raid10 cache
> device (4 SSDs) and 3 md raid5/6 backing devices. This setup has been
> well behaved for about 6 months.
>
> If this isn't a known issue is there anything I can do to provide more
> useful information?
>
> I'm running kernel 3.15.8-200.fc20.x86_64.
>
> [210884.047249] BUG: unable to handle kernel NULL pointer
> dereference at 0000000000000008
> [210884.055605] IP: [<ffffffffa01625fc>]
> bch_btree_node_read_done+0x4c/0x450 [bcache]
> [210884.063723] PGD 0
> [210884.066053] Oops: 0002 [#1] SMP
> [210884.069610] Modules linked in: lp parport binfmt_misc
> ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat xt_CHECKSUM
> iptable_mangle tun bridge stp llc xt_multiport ebtable_nat
> ebtables hwmon_vid ip6t_REJECT nf_conntrack_ipv6 nf_conntrack_ipv4
> nf_defrag_ipv6 nf_defrag_ipv4 ip6table_filter xt_conntrack
> ip6_tables nf_conntrack keyspan ezusb kvm_amd kvm crct10dif_pclmul
> crc32_pclmul crc32c_intel ghash_clmulni_intel microcode serio_raw
> amd64_edac_mod edac_core fam15h_power k10temp edac_mce_amd
> sp5100_tco i2c_piix4 igb ptp pps_core dca shpchp acpi_cpufreq
> btrfs bcache raid456 async_raid6_recov async_memcpy async_pq
> async_xor async_tx xor raid6_pq raid10 i2c_algo_bit drm_kms_helper
> ttm drm i2c_core mpt2sas mvsas libsas raid_class
> scsi_transport_sas cpufreq_stats
> [210884.140704] CPU: 5 PID: 11188 Comm: kworker/5:1 Not tainted
> 3.15.8-200.fc20.x86_64 #1
> [210884.149069] Hardware name: /H8DG6/H8DGi, BIOS 3.0a 07/2
> [210884.155280] Workqueue: bcache cache_lookup [bcache]
> [210884.160531] task: ffff880218633160 ti: ffff8800217b8000
> task.ti: ffff8800217b8000
> [210884.168502] RIP: 0010:[<ffffffffa01625fc>]
> [<ffffffffa01625fc>] bch_btree_node_read_done+0x4c/0x450 [bcache]
> [210884.179105] RSP: 0000:ffff8800217bbbe8 EFLAGS: 00010212
> [210884.184806] RAX: 0000000000000400 RBX: ffff880245ec0000 RCX:
> 0000000000000000
> [210884.192480] RDX: 0000000000000000 RSI: ffff880418380000 RDI:
> 0000000000000246
> [210884.200075] RBP: ffff8800217bbc10 R08: 0000000000000000 R09:
> 0000000000000f6b
> [210884.207738] R10: 0000000000000000 R11: 0000000000000400 R12:
> ffff880413d06c00
> [210884.215391] R13: 0000000000000000 R14: ffff8800217bbc20 R15:
> ffff880413d06c00
> [210884.222961] FS: 00007f73bacd6880(0000)
> GS:ffff88021fd40000(0000) knlGS:0000000000000000
> [210884.231516] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [210884.237557] CR2: 0000000000000008 CR3: 0000000001c11000 CR4:
> 00000000000407e0
> [210884.245131] Stack:
> [210884.247395] ffff880274f4d020 ffff880413d06c00
> 0000bfcc44a463f8 ffff8800217bbc20
> [210884.255337] ffff880413d06c00 ffff8800217bbc78
> ffffffffa0162b68 0000000000000000
> [210884.263256] ffff880218633160 0000000000000000
> 0000000000000000 0000000000000000
> [210884.271234] Call Trace:
> [210884.273985] [<ffffffffa0162b68>]
> bch_btree_node_read+0x168/0x190 [bcache]
> [210884.281258] [<ffffffffa0163f69>]
> bch_btree_node_get+0x169/0x290 [bcache]
> [210884.288377] [<ffffffffa01642f5>]
> bch_btree_map_keys_recurse+0xd5/0x1d0 [bcache]
> [210884.296311] [<ffffffffa016dcb0>] ?
> cached_dev_congested+0x180/0x180 [bcache]
> [210884.303953] [<ffffffff8135b204>] ?
> call_rwsem_down_read_failed+0x14/0x30
> [210884.311158] [<ffffffffa01673f7>]
> bch_btree_map_keys+0x127/0x150 [bcache]
> [210884.318273] [<ffffffffa016dcb0>] ?
> cached_dev_congested+0x180/0x180 [bcache]
> [210884.325826] [<ffffffffa016e7f5>] cache_lookup+0xf5/0x1f0 [bcache]
> [210884.332325] [<ffffffff810a4af6>] process_one_work+0x176/0x430
> [210884.338427] [<ffffffff810a578b>] worker_thread+0x11b/0x3a0
> [210884.344282] [<ffffffff810a5670>] ? rescuer_thread+0x3b0/0x3b0
> [210884.350447] [<ffffffff810ac528>] kthread+0xd8/0xf0
> [210884.355615] [<ffffffff810ac450>] ? insert_kthread_work+0x40/0x40
> [210884.362017] [<ffffffff816ff93c>] ret_from_fork+0x7c/0xb0
> [210884.367756] [<ffffffff810ac450>] ? insert_kthread_work+0x40/0x40
> [210884.374234] Code: 08 01 00 00 48 8b b8 58 cb 00 00 e8 bf 25 01
> e1 49 8b b4 24 80 00 00 00 49 89 c5 31 d2 0f b7 86 32 04 00 00 66
> f7 b6 30 04 00 00 <49> c7 45 08 00 00 00 00 0f b7 c0 49 89 45 00
> 48 8b 43 10 48 85
> [210884.395405] RIP [<ffffffffa01625fc>]
> bch_btree_node_read_done+0x4c/0x450 [bcache]
> [210884.403389] RSP <ffff8800217bbbe8>
> [210884.407171] CR2: 0000000000000008
> [210884.411233] ---[ end trace 0064e6abfd068c85 ]---
> [210884.416352] BUG: unable to handle kernel paging request at
> ffffffffffffffd8
> [210884.423871] IP: [<ffffffff810acb10>] kthread_data+0x10/0x20
> [210884.429915] PGD 1c14067 PUD 1c16067 PMD 0
>
> --Larkin
>
> --
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next prev parent reply other threads:[~2014-08-13 16:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-13 5:02 Null pointer oops Larkin Lowrey
[not found] ` <CALJ65z=25CrrO9uMc2vfYVAQWb=6eK+OhB5TGJJrCp=D4ALvrQ@mail.gmail.com>
2014-08-13 16:40 ` Larkin Lowrey [this message]
2014-08-13 17:41 ` Slava Pestov
2014-08-13 18:35 ` Larkin Lowrey
2014-08-13 18:45 ` Slava Pestov
2014-08-13 21:21 ` Larkin Lowrey
2014-08-13 21:25 ` Slava Pestov
2014-08-13 21:30 ` Slava Pestov
2014-08-13 21:34 ` Jianjian Huo
2014-08-13 22:14 ` Larkin Lowrey
2014-08-16 5:48 ` Peter Kieser
2014-08-13 21:32 ` Larkin Lowrey
2014-08-13 21:37 ` Slava Pestov
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